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Two antibodies against flaviviruses
Flaviviruses are a group of RNA viruses that include the human pathogens dengue virus, Zika virus, and West Nile virus. The envelope protein (E) on the virus surface has been the target of vaccine development, but problems have arisen with antibodies against E, leading to enhanced infection. Now, Modhiran et al. and Biering et al. describe two different antibodies that bind to the flavivirus NS1 protein and prevent it from disrupting epithelial cells, which is associated with severe disease. Both antibodies cross-react with multiple flavivirus NS1 proteins. The antibodies reduce viremia and increase survival in mouse models of flavivirus disease. Both papers include structures of NS1 bound to an antibody, which give insight into the protective mechanism.
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